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O. W. HOFFMAN. BRAKE FOR DUMB WAITERS.

(No Model.)

No. 601,963. Patented Apr. 5,1898.

INVENITOR WITNESSES A TTORNE Y8.

UNITE STATES,

PATENT OFFICE.

CHARLES w. HOFFMAN, on NEW 'YORK,IN. Y.

BRAKE FOR DUMB-WAITERS.

' SPECIFICATION forming'part of Letters Patent N 0. 601,963, dated April5, 1898.

Application filed January 5, 1898. $erial No. 665,620. (N model.) v

To all whom it may concern:

Be it known that 1, CHARLES W. HOFFMAN, of New York city, in the countyand State of New York,have invented anew and Improved Brake for Dumb-Waiters, of which the following is a full, clear, and exactdescription. The object of the invention is to provide a new andimproved brake mechanism for dumb-waiters which is simple and durable inconstruction, very eifective in operation, not liable to get out oforder, and arranged to automatically brake the cage and its loadwhenever the operator releases the manipulating-rope on both the upwardand downward pull.

The invention consists of novel features and parts and combinations ofthe same, as will be hereinafter fully described, and pointed out in theclaims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation of the improvement with the shaft insection. Fig. 2 is a sectional front elevation of the same. Fig. 3 is aplan view of the same. Fig. 4 is a sectional plan view of the same onthe line 4 4 of Fig. 2, and Fig. 5 is a sectional side elevation of thebrake proper. V

In the shaft A is arranged to move a cage 13, supported on acounterbalancing mechanism consisting of a rope O, passing over a pulley0', having its shaft 0 journaled in suitable bearings in an overheadframework 0 arranged at or 'near the top of the shaft A. Thedownwardly-extending end of the rope C carries the usual counterweight Cto coun terbalance the cage 13. The hoisting or manipulating rope Dextends in the front of the shaft A and passes at its upper end over asheave D, to then pass under pulleys E, journaled on the top of the cageB, to connect with a rod F, having a limited sliding motion in avertical direction in a bearing G, forming part of the framework in theupper end of the shaft A. The lower end of the manipulating-rope Dpasses around a sheave D in the bottom of the shaft and then overpulleys E, secured to the under side of the cage B, the end of the ropebeing clamped in a slide with the usual brake-band K, engaging abrake-pulley K secured on the shaft 0 of the counterbalancing device. Onthe free end of the lever K is arranged a Weight K for normally holdingthe brake-band K in firm engagement with the pulley K to brake thelatter and consequently the counterbalancing device and the cage. Therope I is also connected with a second rope I, extending within theshaft A and having its other end attached to the slide H, connected withthe lower end of the manipulating-rope D. The said second rope I passesunder pulleys J J 2 to properly extend within the shaft A and connectwith the rope I, as will be readily understood by referenceto Figs. 1and 2.

Now it is evident that as long as the cage B is at a standstill theweight K of the brakelever K holds the brake applied to prevent the cagefrom ascending or descending. When the operator desires to raise thecage B, he pulls on the manipulating-rope D in a desired direction, sothat a pull is exerted in the same direction on the rope F,which drawson the rope I and thereby causes an upward swinging of the brake-lever Kto release the brake-band K from its pulley K and allow of raising theload upon a further pulling of H by means of a clamping-lever H, as isthe manipulating-rope D, it being understood that the rod F, afteritattains its lowermost position on the bearing G, holds the upper end ofthe rope D securely in place to cause an upward traveling of the cage Bin the usual manner. As soon as the operator releases the pull on therope D the weight K of the brakelever causes the latter to swingdownward to apply the brake-band K on the pulley K and hold the cage Bin position. Whenit is desired to lower the cage B, the operatorpulls onthe manipulating-rope D in an upward direction, so that the slide H isdrawn in a like direction and a pull is exerted on the rope I, andconsequently on the rope I, to impart an upward swinging motion to thebrakelever K to release the brake-band K on the pulley K A further pullon the rope D draws the cage 13 downward, as the lower end of the rope Dis securely held in place on the slide I-I, now in its uppermostposition.

Now it is evident from the foregoing that whenever the operator releasesthe manipulating-rope D the weight K of the brake-1ever at once appliesthe brake and holds the cage and its load in position, and as soon asthe operator pulls on the manipulating-rope in either an upward ordownward direction the brake is opened, so that the cage B can ascend ordescend, according to the direction in which the rope is pulled.-

A third rope 1 hanging down in the front portion of the shaft A, may beconnected with the rope I to allow the operator to open the brakemechanism without first pulling the rope D. This rope I is veryserviceable for without deviating from the spirit of my in- 1 ventionacage, of a hoisting-rope therefor, movable pieces with which the ends ofthe ropes are connected, a brake mechanism, and connections between saidmovable pieces and said brake mechanism, whereby the brake is releasedwhenever a pull is exerted on the said rope, substantially as shown anddescribed.

2. In a dumb-waiter, the combination with a cage, of a hoisting-ropetherefor, slides having a limited sliding motion and with which the endsof the said rope are connected, a

brake mechanism normally braking the counterbalance of the dumb-waiter,and connections between the said slides and the said brake mechanism,whereby the brake is released whenever a pull is exerted on said rope,substantially as shown and described.

CHARLES W. HOFFMAN. Witnesses:

THEO. G. HOSTER, EVERARD l3. MARSHALL.

